Enhanced Vertical Charge Transport in a Semiconducting P3HT Thin Film on Single Layer Graphene

被引：105
作者：
Skrypnychuk, Vasyl [1 ]
Boulanger, Nicolas [1 ]
Yu, Victor
Hilke, Michael [2 ]
Mannsfeld, Stefan C. B. [3 ]
Toney, Michael F. [3 ]
Barbero, David R. [1 ]
机构：
[1] Umea Univ, Dept Phys, S-90187 Umea, Sweden
[2] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada
[3] Stanford Synchrotron Radiat Lightsource, Menlo Pk, CA 90187 USA
来源：
ADVANCED FUNCTIONAL MATERIALS | 2015年 / 25卷 / 05期
关键词：
graphene; organic semiconductor; P3HT; crystallization; charge transport; POLY(3-HEXYLTHIOPHENE); MORPHOLOGY; MICROSTRUCTURE; MOBILITY; DEVICE;
D O I：
10.1002/adfm.201403418
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The crystallization and electrical characterization of the semiconducting polymer poly(3-hexylthiophene) (P3HT) on a single layer graphene sheet is reported. Grazing incidence X-ray diffraction revealed that P3HT crystallizes with a mixture of face-on and edge-on lamellar orientations on graphene compared to mainly edge-on on a silicon substrate. Moreover, whereas ultrathin (10 nm) P3HT films form well oriented face-on and edge-on lamellae, thicker (50 nm) films form a mosaic of lamellae oriented at different angles from the graphene substrate. This mosaic of crystallites with - stacking oriented homogeneously at various angles inside the film favors the creation of a continuous pathway of interconnected crystallites, and results in a strong enhancement in vertical charge transport and charge carrier mobility in the thicker P3HT film. These results provide a better understanding of polythiophene crystallization on graphene, and should help the design of more efficient graphene based organic devices by control of the crystallinity of the semiconducting film.
引用
收藏
页码：664 / 670
页数：7
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